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Subject: Re: Octane vs. carbon buildup?

Virtual Bob wrote:
I also was told of such problem with my non-Audi cars by the mechanics.
Funny thing -- majority of 'em recommend lower octane (in high-octane
capable cars).

Why as why?
I've heard the same.  Apparently the ford explorer has a pin in the ecu that 
can be pulled to make the car retard the timing (specifically to deal with 
carbon buildup in higher mile cars).  A mechanic recommended the same thing: 
lower octane fuel.